Crypto is about conscious decisions

In this field, the issue is not right or wrong decisions
- but conscious decisions. You are only fully in charge of
security if you also understand the limitations of your
system. It allows you to act if any of the preconditions
changes

Digital Signature using J2EE - source code samples explained

Adaptations in different forms. Assuming JDK 1.4+

The Danish government has attempted to introduce digital
signature.

OCES is the official term for the
offical danish digital signature project.